Relief mechanism for pressure-exerting machines.



3 SHEETS-SHEET 1.

AcmNEs. l Patented Mar. 9, 1909.

W. A. CORNBROOKS. ISM FOR PRESSURE EXERTING M A`PPLIOATION FILED JUNE 4, 1907.

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RELIEF MEGHAN mww.

' w. A. 909199900119 RELIEF MEGHANISM FOR PRESSURE EXEBTING MACHINES. 914,799. N Hm mm N7' Patented Mar. 9, 1909.

` W. A. CORNBROUKS. RELIEF MEGHANISM POR PRESSURE EXERTING Patented Mar. 9, 1909. 3 SHEETS-SHEET 3.

MACHINES.

APPLIOATIN FILED JUNE f1, 1907.

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. in which hold the Work, coperates with an WILLIAM A. CORNBROOKS, OF MOLINEJ, ILLINOIS,4

ASSIGNOR TO WILLIAMS, WHITE &

COMPANY, A. CORPORATION L.OF ILLINOIS. l RELIEF GR PRESSURE-EmRTlN-G MACHINES.

Specification of- Letters Patent.

Patented March 9, 1909.

unmanaged .ma 4, raar. serial No. 371,194.

.To all whom it may concern:

Be it known that I, WILLIAM A. Conn- BRooKs, of Moline, county of Rock Island, and State of Illinois, have inventada new and useful Improvement in Relief Mechanismfor Pressure-Exerting Machines, of which the following is a specification.

This invention relates to power-actuated pressure exerting machines, and has reference more particularly to machines for upsetting, forging, or otherwise shaping metal, mac es a gripping die or slide to upsetting or forming slide or die, in such manner that the blank or work acted on is given the de' sired shape or form. 1

The invention is directed to the actuating devices for the gripping die, and the invention consists in an improved construction of said actuating devices, whereby in the event of the gripping die encountering an abnormal obstruction, such for instance as a misplaced blank in the die cavity, or an excess of material, etc., the actuating devices will give or yield in such manner as to relieve the grip ing die ofits actuating pressure ,whereby reakage of or injury to the parts of the machine is prevented.

In the specific embodiment of my inven-A tion, the power driven means actuates the operating slide which is connected with the griplping die by two pairs of connected toggle evers, in such manner that the grippling die will be caused to reciprocate in a pat at right angles to the movement of the oper-ating slide, and to the toggle lever which is connected with the operating slide, is ap lied Va spring-relief mechanism, in the form o -two coperating springs, disposed on opposite sides res ectively of said toggle lever, and so arranged relatively to each other and to the lever, that the s rings in tending to expand, will extend the' ks and cause them to impart motion from the operating slide to the gripping die, which springs however, will permit the toggle lever to yield in the event of the gripping die meeting with an abnormal obstructlon, thereby placing the springs under compression.

The invention consists also in the -details of construction and combination of parts Y hereinafter described and claimed.

In the accompanying drawings Figure 1 a top plan view of an upsetting machine having my invention embodied therein, the

Fig. 2

arts being in the position they occupy at the beginning of the stroke of the operatlng slide. is a similar view withthe arts in the ition they occupy at the end oigthe stroke.

-igsisa similar view, showing the toggle lin as they appear when they yield and place the springs under compression, in the event of some abnormal obstruction preventing the gripping die from completin its stroke. ig. 4 is a transverse sectiona elevation taken through the longitudinal axis of the pressure springs. Figs. 5 and 6A are enlarged sectional plan views showing the operating slide, one of the links of the rimary toggle, and the pressure springs in t eir different positions. Fig. 7 1s a horizontal sectional plan view through the rocking cup in which one of the pressure springs is seated, and through the -adjacent parts, said spring being removed. Fig. 8 is a plan view of the cup removed.

Referring to the drawingsz-1 represents a suitable bed-frame adapted to give support tothe operative This bed-frame is provided with longitudinally extending vertical guides 3 and 4, beltween which an operating slide 5 reciprocates. The frame is also provided with transversely extending vertical guides 6 and 7, between which a gripping d1e or slide 8 reciprocates. This die in its advance moves ment is adapted to grip the work or blank against a fixed die 9, so that it may be acted on by an upsetting or forging die 10, reciprocating lon itudinally of the frame between lonlgitudina y extendlng guides 16a. y

"he gripping dieA 8 has jointed to it a link 8, which 1s jointed to a link 8b, which is in turn jointed to the frame, as at 8, these two links 8a and 8b constituting a toggle lever, which when its links are extended as shown in Fig. 2, will advance the die, and which when the links form an angle with each other, ais shown in Figs. 1 and 3, will retract the The end of link 8a is provided with a lateral eXtensionSd, to which is jointed one end of a link 5a, which is 'ointed at its opposite end to one end of a lin 5b, which latter is in turn jointed at its opposite end to the operating slide 5, the links v5a and 5b constituting a toggle *lever which forms an operative connectlon between the operatin slide and the gripping die, through the me ium of the interpose toggle lever first described, 'by

- lower horizontal parallel p ates 5c an spiral spring 17, bearin ing socket in the side of the link 5b.

means of which connectin mechanism the gripping die will be cause to advance and retreat as the operating slide is correspondingly moved. For convenience of description, I will refer to the toggle lever which is connected with the operatin slide, as the primary to gle lever, an that which is connected wit ihe gripping die as the secondary toggle ever.

The operating slide may be actuated by any appro riate means, but I prefer to emloy for t is purpose a transverse driving shaft 11, mounted in bearings 11a in the bedframe and rotated from any suitable source of power, the shaft being provided with a crank 11b connected bypitman 11c with the operating slide. For thepurposeof operating the upsetting die 10 with a reciprocating motion, a second crank 11 is provided, con'- nected by pitman 11 with the upsetting slide 10.

The operating slide 5 com rises upper;1 a?? connected together at olpposite sides by vertical plates 5e and 5f, t e tog le link 5", before alluded to, being jointe between the upper and lower plates on a vertical pivot in 5g.

As shown more' particularly in Figs. 7, 8 and 9, the vertical connecting late 5e of the opleratiiig slide is formed wit 1 an opening w ich receives a cup or casin 14, provided on diametrically opposite si es with trunnions 14, seated in open vertical alining slots or sockets in the edges of the plates 5 and 5d of the slide, whereby the cup is supported so that it may rock on a vertical axis. The bottom of the cup is provided with a hole 14", throu h which is extendeda horizontal rod 15, W iich rod extends also through a horizontal openin 14c in the link 5b and terminates at its en s some distance beyond the sides of the operating slide. The rod is encircled at one end by a spiral spring 16, having its inner end seated in the rocking cup 14, and having its outer end bearing a ainst a head 15a fixed to the end of the ro At its other end, the rod is encircled by a second at its outer end against a head 15b, iixe to the end of the rod, and bearing at its inner end against a washer or slide 15, having a rounded inner surface seated so as to rock in a corres ondhese slprings in their tendency to expand,

raw the link 5b laterally so as to extend the primary toggle asindicated in Figs. 1 and 2, to its active position, the spring 16, by bearing on head 15a, ulling the rod 15 in the same direction as t at which the other spring tends to push the link 5b, with the result that both springs operate in the same direction on Athe link, and act to. hold it yieldingly in its extended operative position. The extension of the links of the to gle is, however, determined and.controlle ly-a stop lug 18, carried by the o erating s 'de in position to be engaged by t e link 5a when the latter is extended, the relation of the sto to the link being such that the toggle will e so held by the sprin that the axis connecting links 5 and 5b will be slightly to one side of a line drawn through axis 5g, and that connecting link 5a with extension 8 d, with the result that if the operating slide meets with a resistance in its advance, due to an obstruction to the movement of the gripping die, the links 5a and 5*? of the rimary toggle will overcome the tendency o the springs to hold them extended, and will assume the position shown in Fig. 3, thereby placing the s rings under compression.

such that they will normally hold the links extended against such pressure as is necessary to be imparted to the gripping die in performing its proper functions in gripping the Work under'treatment, but not a ainst an abnormal resistance, such as would e caused by the work being misplaced, or an excess of material, or similar abnormal conditions.

In such an event, the primary to gle will yield, and although the operating s de continue to advance and complete its stroke,

the gripping die will come to rest and then be retracted, owing to the lateral pressure exerted by link 5 on the extension 8d of the secondary toggle, as the operating slide continues to advance, as shown in Fi 3, this lateral pressure causing the links o the secondary toggle to assume angular relations to each other and retract the die. l

By the provision of the two coperating relief springs, alpplied as described, the re uisite degree of exiblity is obtained, an at the same time the necessary strength is secured, without the s rin s being of undue length, which would e t e case if but one spring were employed. By reason of fact, the action of the springs is more uniform, kand better fitted to meet the varying conditions in the operation of the machine, as regards the character of the work, and p ther conditions encountered-in actual pracice.-

Having thus described my invention, what I claim is 1. Ina machine of the type described, the combination of a reciprocating pressure exertin member, a reciprocating operating mem er therefor, operative connections between the Itwo members includin a toggle lever, coperating springs arrange one each on opposite sides of the to gle lever and acting coperatively to hold the saine yieldingly extended, and means connecting said springs and causing them both to act in the same direction on said tog le lever.

2. In a machine o the type described, the

combination of a reciprocating operating 1 The tension of t e springs is this slide, a transversely reciprocating pressure ing slide, and a second spring encircling the applying slide, operative connections berod at the opposite side of the link with its 50 tween said slides comprising primary and outer end bearing against the head on the secondary to gle levers connected together rod', and its inner end acting against the link,- and connecte to said slides, a s ring actin 5. In a machine of the type described, the on one side of the primary togg elever an combination of a reciprocating operating l tending to extend it, a second s ring armember, a reciprocating pressure exerting 55 ranged at the opposite side of t e toggle member, operative connections between the lever and acting respectively against the two including a toggle lever connected with slide and in the`direction of action of the theo eratingmember,aspring reliefmechanf first spring, andI coperatin with the latter. ism or the toggle lever, s aid mechanism in tending to hold the togg e extended, and comprising two coperating springs arranged 60 means connecting said Asprings and causing respective y on oppositesides ofthe toggle them both to `act in the same direction on lever, and tending by their expansion to hold said toggle lever. the toggle lever yieldingly extended, and

3. In a machine of the type described, the means connecting said springs and causing vcombination of anoperating slide, a transthem to act in the same direction on the 65 versely movable pressure exerting shde, optoggle lever. v erative connections between the two shdes 6. In a machine of theype described, the comprising a primary toggle lever connected combination of an operating slide, a preswith the operating slide, and a secondary sure exerting member, erative connections o toggle 'lever connected with the pressure between the two inclu ng toggle links 5a. 70

exerting Slide and withthe primary tog le and 5b, the latter beingjomted to theoperatlever, a rod extending transversely of t e ing slide, and the former being operatively movement of the operating slide and` proconnected with thepressure exerting memvided on o pposite ends wi heads, a s iral ber, and the link 5b having an opening therei spring encircling the rod at one side or the t rough, a spring-bearing or cup provided 'i5v primary. toggle lever and bearing at its outer with trunnions seated in sockets 1n the slide second s ring'encircling the rod at the opsaid cup and through the opening in the link posite si e ot the toggle lever and bearing at 5- and terminating at its ends atthe opposite 8d its outer end against the head on the rod, sides of said link, heads on the ends of said and at'its inner end against the toggle lever. rod, a spiral spring encircling the rod with n a machine ofthe type described, the its inner end seated in the spring cup or icombination of an operating slide,- a transbearing and its outer end bearing on the lversely7 reciprocating pressure exerting slide, head on the end of the rod, and `a second 85 operative connections between said slides spiral spring encirclin the rod at the opcomprisingalongitudinallyarranged rimary osite side of the with its outer en d togg e lever consisting of links 5a an 5b, and caring against the head on the rod,'and its a transversely arranged secondary toggle inner end acting against the link: i

lever connected with the link 5a, a spring In testimony whereof I hereunto set my 90` s u porting rod extending transversely of the hand this 24th day of April, 1907, in the lin 5 b and through the same, heads on the presence of-two attesting witnesses.

opposite ends of said rod, a spiral sprin en-A WILLIAM 4A. CORNBROOKS. circhng the rod at one side ofthe tog le ever Witnesses: I with its outer end bearing againstt e head HARRY ArNswoRTn,

and its inner end bearing against the operat- C. W. FISKE. 

